EP2986964B1 - Appareil et procédés pour la vérification d'un capteur d'un dispositif de mesure vibratoire - Google Patents

Appareil et procédés pour la vérification d'un capteur d'un dispositif de mesure vibratoire Download PDF

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Publication number
EP2986964B1
EP2986964B1 EP14721171.8A EP14721171A EP2986964B1 EP 2986964 B1 EP2986964 B1 EP 2986964B1 EP 14721171 A EP14721171 A EP 14721171A EP 2986964 B1 EP2986964 B1 EP 2986964B1
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EP
European Patent Office
Prior art keywords
sensor
time period
sensor time
temperatures
sensor assembly
Prior art date
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Active
Application number
EP14721171.8A
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German (de)
English (en)
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EP2986964A1 (fr
Inventor
Simon P. H. WHEELER
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Micro Motion Inc
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Micro Motion Inc
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Publication date
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Priority to EP16150406.3A priority Critical patent/EP3035028B1/fr
Publication of EP2986964A1 publication Critical patent/EP2986964A1/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
    • G01N11/16—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring damping effect upon oscillatory body
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/32—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise
    • G01N29/326—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise compensating for temperature variations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
    • G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
    • G01N2009/006—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis vibrating tube, tuning fork
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N2011/0006—Calibrating, controlling or cleaning viscometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N2011/0006—Calibrating, controlling or cleaning viscometers
    • G01N2011/0013—Temperature compensation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N2011/0006—Calibrating, controlling or cleaning viscometers
    • G01N2011/002—Controlling sample temperature; Thermal cycling during measurement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02818—Density, viscosity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/10—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing bodies wholly or partially immersed in fluid materials

Definitions

  • the present invention relates to vibrating element meters, and more particularly, to a method and apparatus for validating a sensor assembly of a vibrating element meter.
  • Vibrating meters such as for example, liquid density meters, gas density meters, liquid viscosity meters, gas/liquid specific gravity meters, gas/liquid relative density meters, and gas molecular weight meters, are generally known and are used for measuring characteristics of fluids.
  • meters comprise a sensor assembly and an electronics portion.
  • the material within the sensor assembly may be flowing or stationary.
  • Each type of sensor may have unique characteristics, which a meter must account for in order to achieve optimum performance. For example, some sensors may require a tube apparatus to vibrate at particular displacement levels. Other sensor assembly types may require special compensation algorithms.
  • the meter electronics typically include stored sensor calibration values for the particular sensor being used.
  • the meter electronics may include a reference sensor time period (i.e. the inverse of the reference resonant frequency).
  • the reference sensor time period represents a fundamental measurement performance of the sensor geometry for a specific sensor assembly, as measured in the factory under reference conditions.
  • a change between a sensor time period measured after a vibrating element meter is installed at a customer site and a reference sensor time period may represent physical change in the sensor assembly due to coating, erosion, corrosion, or damage to the vibrating element sensor, in addition to other causes.
  • a commonly used technique to monitor a change of sensor time period in vibratory meters is to perform an air-point health check, a vacuum-point health check, or a health check using any fluid having an accurately known density.
  • a meter is taken off-line and placed under test conditions. The meter is sometimes cleaned before being placed under test conditions, either through mechanical or solvent-based techniques.
  • Either a liquid or gas meter may next be placed under a vacuum or filled with a fluid having an accurately known density, such as air or water.
  • the test conditions commonly include placing the meter under ambient air conditions.
  • the test conditions commonly include placing the meter under vacuum conditions.
  • the sensor time period is then determined and compared to the reference sensor time period measurement.
  • test measurements are taken under conditions that may be different from the reference conditions of a health check test.
  • the sensor time period measured during a health check may therefore reflect variations in vibrational response due not only to changes in a sensor assembly, but also due to differences between reference and test conditions.
  • Current health check methodologies fail to isolate changes in vibrational response due to changes in the physical sensor assembly and changes in test conditions.
  • the sensor time period measurement may be affected by temperature.
  • the first reason that temperature may affect a sensor time period is because temperature may affect the stiffness of the sensor assembly itself.
  • the second reason is because the density of fluid moving in a sensor assembly may be dependent on temperature.
  • a third mechanism that temperature may affect the robustness of a health check is if the sensor assembly is not at a stable temperature or if there is a temperature drift. None of these temperature effects are accounted for under the conventional vibratory sensor health check techniques, which may lead to false indications that a sensor assembly is either faulty or healthy. Errors may lead to incorrect customer decisions and unnecessary service calls.
  • US 2001/045134 A1 discloses a vibrating element meter for meter health verification, the vibrating element meter comprising: a sensor assembly including a vibrating member, a pickoff/detection sensor, and a driver configured to vibrate the vibrating member; at least one temperature sensor; and meter electronics coupled to the pickoff/detection sensor, the driver, and the at least one temperature sensor, with the meter electronics being configured to measure a plurality of temperatures using the at least one temperature sensor, determine an average temperature from the plurality of temperatures.
  • US 2003/140712 A1 is related to mass flow measurement and control.
  • US 4 734 609 A discloses an altimeter.
  • What is needed is a sensor health assessment that corrects for variations in measured sensor time period due to temperature, pressure, and density. What is also needed is a method to determine whether a sensor assembly is stable enough to provide an accurate result from an air-point health check, a vacuum-point health check, or a health check using another fluid.
  • the vibrating element meter includes a sensor assembly, at least one temperature sensor, and meter electronics.
  • the sensor assembly includes a vibrating member, a pickoff/detection sensor, and a driver configured to vibrate the vibrating member.
  • the meter electronics is coupled to the pickoff/detection sensor, the driver, and the at least one temperature sensor.
  • the meter electronics is configured to measure a plurality of temperatures using the at least one temperature sensor.
  • the meter electronics is further configured to measure a plurality of sensor time periods using the sensor assembly.
  • the meter electronics is further configured to determine an average temperature from the plurality of temperatures.
  • the meter electronics is further configured to determine an average sensor time period from the plurality of sensor time periods.
  • the meter electronics is further configured to compensate the average sensor time period using the average temperature to generate a compensated sensor time period.
  • the meter electronics is further configured to compare the compensated sensor time period to a reference sensor time period.
  • the meter electronics is further configured to indicate whether the compensated sensor time period is within a sensor time period error limit of the reference sensor time period.
  • a method for verification of a sensor includes the step of measuring a plurality of temperatures using at least one temperature sensor and a plurality of sensor time periods using a sensor assembly.
  • the sensor assembly includes a vibrating member, a pickoff/detection sensor, and a driver configured to vibrate the vibrating member.
  • the method further comprises the step of determining an average temperature from the plurality of temperatures.
  • the method further comprises the step of determining an average sensor time period from the plurality of sensor time periods.
  • the method further comprises the step of compensating the average sensor time period using the average temperature to generate a compensated sensor time period.
  • the method further comprises the step of comparing the compensated sensor time period to a reference sensor time period.
  • the method further comprises the step of indicating whether the compensated sensor time period is within a sensor time period error limit of the reference sensor time period.
  • a method for health verification of a sensor includes the step of measuring a plurality of temperatures using at least one temperature sensor and a plurality of sensor time periods using a sensor assembly.
  • the sensor assembly includes a vibrating member, a pickoff/detection sensor, and a driver configured to vibrate the vibrating member.
  • the method further comprises the step of calculating a first standard deviation using a first data set comprising one of the plurality of temperatures or the plurality of sensor time periods.
  • the method further comprises the step of comparing the first standard deviation to a first limit.
  • the method further comprises the step of indicating whether the first standard deviation is greater than the first limit.
  • measuring the plurality of temperatures using the temperature sensor and the plurality of sensor time periods using the sensor assembly further includes cleaning the sensor assembly.
  • measuring the plurality of temperatures using the temperature sensor and the plurality of sensor time periods using the sensor assembly further includes filling the sensor assembly with ambient air.
  • measuring the plurality of temperatures using the temperature sensor and the plurality of sensor time periods using the sensor assembly further includes placing the sensor assembly under a vacuum.
  • measuring the plurality of temperatures using the temperature sensor and the plurality of sensor time periods using the sensor further includes filling the sensor assembly with or inserting the sensor assembly into a fluid having an accurately known density.
  • the meter electronics is further configured to calculate a standard deviation using one of the plurality of temperatures and the plurality of sensor time periods, compare the standard deviation to a limit, and indicate whether the standard deviation is greater than the limit.
  • the meter electronics is further configured to receive an altitude, and compensate the compensated sensor time period using the altitude.
  • the meter electronics is further configured to measure a density of a fluid using the sensor assembly, and compensate the compensated sensor time period for a difference in density between the reference density and the measured density using the altitude and the average temperature.
  • the method further includes the steps of calculating a second standard deviation using a second data set comprising one of the plurality of temperatures or the plurality of sensor time periods, wherein the first data set is different from the second data set, comparing the second standard deviation to a second limit, and indicating whether the second standard deviation is greater than the second limit.
  • FIGS. 1-5 and the following description depict specific examples to teach those skilled in the art how to make and use the best mode of the Application. For the purpose of teaching inventive principles, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations from these examples that fall within the scope of the Application. Those skilled in the art will appreciate that the features described below may be combined in various ways to form multiple variations of the Application. As a result, the Application is not limited to the specific examples described below, but only by the claims and their equivalents.
  • FIG. 1 shows a vibrating element meter 5, a density meter.
  • the vibrating element meter 5 comprises a sensor assembly 10 and meter electronics 20.
  • the embodiment of a density meter is not intended to be limiting, however. Those skilled in the art will readily recognize that embodiments of the Application described herein may be applied to the verification of liquid density meters, gas density meters, liquid viscosity meters, gas/liquid specific gravity meters, gas/liquid relative density meters, gas molecular weight meters, and/or any type of vibrating meter.
  • the vibrating element meter 5 may be configured to measure a density of a fluid, such as a liquid or a gas, for example.
  • the vibrating element meter 5 includes a housing 11 with a vibrating member 12 located at least partially within the housing 11. A portion of the housing 11 is cut away to show the vibrating member 12.
  • the vibrating element meter 5 may be placed in-line in an existing pipeline, for example.
  • the housing 11 may comprise closed ends with apertures to receive a fluid sample, for example. Therefore, while flanges are not shown, in many instances, the housing 11 or the vibrating member 12 may include flanges or other members for operatively coupling the vibrating element meter 5 to a pipeline or similar fluid delivering device in a fluid-tight manner.
  • the vibrating member 12 is cantilever mounted to the housing 11. The vibrating member 12 is shown coupled to the housing 11 at an inlet end 13 with the outlet end 14 free to vibrate.
  • the vibrating member 12 also includes a plurality of fluid apertures 15 near the inlet end 13.
  • the fluid apertures 15 can be provided to allow some of the fluid entering the vibrating element meter 5 to flow between the housing 11 and the vibrating member 12. Therefore, the fluid contacts the inside as well as the outside surfaces of the vibrating member 12. This is particularly helpful when the fluid under test comprises a gas because a greater surface area is exposed to the gas.
  • apertures may be provided in the housing 11 to expose the fluid under test to the outer surface of the vibrating member 12 and therefore, the apertures 15 are not required in the vibrating member 12.
  • FIG. 1 Further shown in FIG. 1 is a driver 16 and a pickoff/detection sensor 17 positioned within a cylinder 50.
  • the driver 16 and pickoff/detection sensor 17 are shown as comprising coils, which are well known in the art. If an electric current is provided to the coil, a magnetic field is induced in the vibrating member 12 causing the vibrating member 12 to vibrate. Conversely, the vibration of the vibrating member 12 induces a voltage in the pickoff/detection sensor 17.
  • the driver 16 receives a drive signal from the meter electronics 20 in order to vibrate the vibrating member 12 at one of its resonant frequencies in one of a plurality of vibration modes, including for example simple bending, torsional, radial, or coupled type.
  • the pickoff/detection sensor 17 detects the vibration of the vibrating member 12, including the frequency at which the vibrating member 12 is vibrating and sends the vibration information to the meter electronics 20 for processing.
  • the vibrating member 12 vibrates, the fluid contacting the vibrating member's wall vibrates along with the vibrating member 12.
  • the added mass of the fluid contacting the vibrating member 12 lowers the resonant frequency.
  • the new, lower, resonant frequency of the vibrating member 12 is used to determine the density of the fluid as is generally known in the art according to a previously determined correlation, for example.
  • Vibrating element meter 5 further includes temperature sensor 112.
  • temperature sensor 112 is coupled to housing 11.
  • temperature sensor 112 may be coupled to driver 16, pickoff/detection sensor 17, inlet 13, or any other part of sensor assembly 10, however.
  • vibrating element meter 5 may include more than one temperature sensor, and each respective temperature sensor may be coupled to the same or different components of the sensor assembly 10.
  • the one or more signals provided by temperature sensors 112 may be combined in any manner commonly known to those skilled in the art to generate a one or more temperature measurement values.
  • FIG. 2 depicts meter electronics 20 of the vibrating element meter 5 according to an embodiment of the Application.
  • Meter electronics 20 may include an interface 201 and a processing system 203.
  • the processing system 203 may include a storage system 204.
  • meter electronics 20 may generate a drive signal to supply to driver 16 and receive signals from pickoff/detection sensor 17 and temperature sensor 112. In some embodiments, meter electronics 20 may receive signals from the driver 16.
  • Meter electronics 20 may operate sensor assembly 10 as a density meter, a viscosity meter, or a flow meter such as a Coriolis mass flow meter. It should be appreciated that meter electronics 20 may also operate other types of vibrating meters, and the particular examples provided should not limit the scope of the present invention.
  • Meter electronics 20 may process vibratory sensor signals in order to obtain one or more characteristics of the material in housing 11.
  • Interface 201 may receive sensor signals from the driver 16, pickoff/detection sensor 17, or temperature sensor 112, via leads. Interface 201 may perform any necessary or desired signal conditioning, such as any manner of formatting, amplification, buffering, etc. Alternatively, some or all of the signal conditioning may be performed in processing system 203. In addition, interface 201 may enable communications between meter electronics 20 and external devices. Interface 201 may be capable of any manner of electronic, optical, or wireless communication. In addition, interface 201 may enable communications between meter electronics 20 and external devices, for example. Interface 201 may be capable of any manner of electronic, optical, or wireless communication.
  • Interface 201 in one embodiment may include a digitizer (not shown), wherein sensor assembly 10 signals comprise analog sensor signals.
  • the digitizer may sample and digitize the analog sensor signals and produce digital sensor signals.
  • the digitizer may also perform any needed decimation, wherein the digital sensor signal is decimated in order to reduce the amount of signal processing needed and to reduce the processing time.
  • Processing system 203 conducts operations of meter electronics 20 and processes density/viscosity/flow measurements from sensor assembly 10. Processing system 203 may also execute one or more processing routines such as sensor verification routine 205.
  • Processing system 203 may comprise a general purpose computer, a micro-processing system, a logic circuit, or any other general purpose or customized processing device capable of performing the functions described herein. Processing system 203 may be distributed among multiple processing devices. Processing system 203 may include any manner of integral or independent electronic storage medium, such as storage system 204.
  • Storage system 204 may store meter parameters and data, software routines, constant values, and variable values.
  • Storage system 204 may comprise a primary or main memory, such as a random access memory (RAM).
  • RAM random access memory
  • storage system 204 may include a hard disk drive, a removable storage device, a memory card, a floppy disk drive, a magnetic tape drive, a compact disk drive, a digital versatile disc, a Blue-ray disc, an optical storage device, tape backup, or any other computer useable or readable storage medium.
  • meter electronics 20 may include various other components and functions that are generally known in the art. These additional features are omitted from the description and the figures for the purpose of brevity. Therefore, the present invention should not be limited to the specific embodiments shown and discussed.
  • FIG. 1 depicts only a single sensor assembly 10 in communication with meter electronics 20, those skilled in the art will readily appreciate that multiple sensor assemblies may be in communication with meter electronics 20. Further, meter electronics 20 may be capable of operating a variety of different sensor types. Therefore, it is important to confirm that the particular sensor assemblies in communication with meter electronics 20 comprise valid sensors.
  • Each sensor assembly such as the sensor assembly 10 in communication with meter electronics 20, may have a respective section of storage system 204 dedicated to an air-point, a vacuum-point, or a fluid health check.
  • the calibration values may include a sensor time period value at reference conditions. Other sensor calibration values are contemplated and are included within the scope of the present invention.
  • Storage system 204 stores variables that may be used by sensor verification routine 205 to verify the health of sensor assembly 10.
  • storage system 204 stores a plurality of temperatures 206 and a plurality of sensor time periods 207.
  • Plurality of temperatures 206 may be determined by obtaining a time series of measurements from the at least one temperature sensor 112.
  • the plurality of sensor time periods 207 may be determined by driving a sensor assembly at its natural frequency and determining the inverse of the frequency of the greatest response.
  • driver 16 may oscillate vibrating member 12, generating signals at the pickoff/detection sensor 17 that may be used to determine a series of sensor time periods of sensor assembly 10.
  • each temperature of the plurality of temperatures 206 may correspond to a respective sensor time period of the plurality of sensor time periods 207.
  • each respective temperature of the plurality of temperatures 206 and each respective sensor time period of the plurality of sensor time periods 207 may be measured at one second intervals for a period of 20 seconds.
  • Storage system 204 also stores an average temperature 208 and an average sensor time period 209.
  • Average temperature 208 may be determined by averaging the plurality of temperatures 206.
  • Average sensor time period 209 may be determined by averaging plurality of sensor time periods 207.
  • Storage system 204 also stores a compensated sensor time period 210.
  • Compensated sensor time period 210 is a value that has been corrected for one or more physical factors that may affect the sensor time period measurement, such as any combination of temperature, pressure, altitude, and density.
  • Compensated sensor time period 210 of sensor assembly 10 may be compensated for temperature.
  • the at least one temperature sensor 112 may indicate that sensor assembly 10 is a different temperature than the reference calibration temperature.
  • the reference calibration temperature may be 20°C. Temperature may affect the stiffness of sensor assembly 10, introducing an offset into the sensor time period measured.
  • compensated sensor time period 210 may be determined by calculating an offset for average sensor time period 209 based on average temperature 208.
  • the density of ambient air may be measured during an air-point health check.
  • the sensor time period measured may further be affected by atmospheric pressure differences between reference conditions at the factory and a customer site. Atmospheric pressure differences between reference conditions and a customer site may be due to differences in elevation between the test sites.
  • the reference atmospheric pressure may be 101.325 kPa. Pressure fluctuations due to weather changes may also be present, but are less significant than changes in pressure due to elevation.
  • the difference in pressure may create an offset in the sensor time period measured.
  • Storage system 204 may further include an altitude 218, a measured density 219, a reference density 220, a density sensitivity 221, a difference density 222, a compensated reference density 223, and a density time period offset 224.
  • Altitude 218 may represent the altitude at which the sensor is installed. In examples not forming part of the present invention, altitude 218 may be input by a user and saved to storage system 204. For example, altitude 218 may be input at the beginning of a health check, upon installation of a sensor at a customer site, or at any other time. In other examples not forming part of the present invention, altitude 218 may be received via electronic message at meter electronics 20.
  • Measured density 219 may be measured during a health check using sensor assembly 10 as described above.
  • Reference density 220 may be a density measured by vibrating element meter 5 under reference conditions with ambient atmospheric gas.
  • ⁇ 0 , T 0 , and P 0 represent the respective reference density, temperature, and pressure.
  • Compensated reference density 223 is represented by ⁇ 1 .
  • T 1 is the temperature of the ambient air at the health check site.
  • T 1 may represent a temperature of the plurality of temperatures 206 or average temperature 208.
  • P 1 is the pressure of ambient air at the health check site.
  • measured density 219 may be compensated to reference altitude, temperature, and pressure.
  • Density sensitivity 221 and difference density 222 may be used to calculate a density time period offset 224.
  • Difference density 222 represents the difference between compensated reference density 223 and measured density 219. This is not intended to be limiting, however. In other embodiments, difference density 222 may represent the difference between a reference density and a measured density compensated to reference altitude, pressure, and temperature.
  • K 1 and K 2 represent calibration constants that may be determined during a meter calibration process.
  • K 1 and K 2 may be determined by a calibration process using two different fluids having densities known to a high accuracy.
  • density time period offset 224 may be used to further compensate compensated sensor time period 210. In other embodiments, density time period offset 224 may be used to compensate average sensor time period 209, or any of the plurality of sensor time periods 207.
  • Reference sensor time period 211 may be measured at the factory under reference conditions before a sensor assembly is shipped to a client.
  • reference sensor time period 211 may represent a reference value determined when the meter is installed or configured at a customer site.
  • Reference sensor time period 211 may be specific to a reference pressure, temperature, altitude, and/or fluid density.
  • reference sensor time period 211 may be determined with vibrating elements of a sensor filled with ambient gas at sea level.
  • reference sensor time period 211 may be determined with the vibrating elements of a sensor under a vacuum.
  • reference sensor time period 211 may be determined under any combination of temperature and pressure, and may include any reference fluid. For example, water may be used as a reference fluid.
  • Sensor time error limit 212 represents the maximum permissible difference between reference sensor time period 211 and a compensated sensor time period 210 allowable to provide a finding of validity for a meter sensor.
  • Storage system 204 may further include a sensor valid indicator 225.
  • Sensor valid indicator 225 may be set upon a determination of whether the difference between compensated sensor time period 210 and reference sensor time period 211 is less than a sensor time error limit 212.
  • Sensor valid indicator 225 may indicate whether sensor assembly 10 may provide accurate measurements of mass flow, density, viscosity, or any other measurement.
  • meter electronics 20 may indicate the status of sensor valid indicator 225 by toggling a light or a display on vibrating element meter 5. In other embodiments, meter electronics 20 may indicate that sensor assembly 10 is valid by sending an electronic report to another computing device.
  • sensor stability may present a further limitation to receiving accurate results.
  • a meter that is not in a stable or a steady state may provide sensor time period measurements that wander over a wide range of values, providing false results.
  • Storage system 204 further includes a standard deviation temperature 213, a standard deviation sensor time period 214, a standard deviation sensor time period limit 215, a standard deviation temperature limit 216, and a condition stable indicator 217 to address this possible limitation.
  • Standard deviation temperature 213 represents the standard deviation of plurality of temperatures 206.
  • Standard deviation sensor time period 214 represents the standard deviation of plurality of sensor time periods 207.
  • Standard deviation temperature limit 216 may represent the maximum standard deviation temperature 213 that a stable sensor may indicate. Standard deviation temperature 213 may be elevated when the temperature of a sensor assembly 10 is changing rapidly. When the standard deviation temperature 213 is greater than standard deviation temperature limit 216, the vibrating meter may not be able to provide reliable measurements, and a health check may not produce accurate results.
  • Standard deviation sensor time period 214 may be elevated for any number of reasons, including when environmental or testing conditions change rapidly.
  • Standard deviation sensor time period limit 215 may represent the maximum sensor time period standard deviation that a stable sensor may indicate. When the standard deviation sensor time period 214 is greater than standard deviation sensor time period limit 215, then the vibrating meter may not be able to provide reliable measurements, and a health check may not produce accurate results.
  • condition stable indicator 217 may be set to indicate whether the sensor is determined to be stable. In embodiments, condition stable indicator 217 may be indicated on a light or another display for a user. In other embodiments, condition stable indicator 217 may be sent via electronic report to another computing device.
  • the storage system 204 includes routines that are executed by the processing system 203.
  • the storage system 204 stores a sensor verification routine 205.
  • Meter electronics 20 may initiate and operate sensor verification routine 205 in order to validate a sensor assembly 10.
  • sensor verification routine 205 may perform a health check to determine the validity of a sensor assembly, and indicate the results via sensor valid indicator 225 using the methods discussed above.
  • sensor verification routine 205 may determine whether the sensor assembly 10 provides stable measurements and indicate the results via condition stable indicator 217, as described above.
  • FIGs. 3-5 depict sensor verification methods 300, 400, and 500 respectively.
  • Sensor verification methods 300, 400, and 500 represent example embodiments of sensor verification routine 205.
  • Processing system 203 may be configured to perform the necessary signal and data processing to execute sensor verification routine 205, which may include performing any combination of sensor verification methods 300, 400, and 500.
  • Sensor verification method 300 of FIG. 3 begins with step 302.
  • step 302 a plurality of temperatures are measured using the at least one temperature sensor and a plurality of sensor time periods are measured using the sensor assembly 10.
  • plurality of temperatures 206 may be measured using temperature sensor 112.
  • plurality of temperatures 206 may be measured using more than one temperature sensor coupled to any part of sensor assembly 10.
  • Plurality of sensor time periods 207 may be determined by vibrating driver 16 and receiving a vibratory response with pickoff/detection sensor 17 at meter electronics 20.
  • step 302 may further include cleaning the sensor assembly 10.
  • the insides or outsides of housing 11, vibrating member 12, inlet end 13, fluid apertures 15, driver 16, pickoff/detection sensor 17, or cylinder 50 may be cleaned with solvent or any other method commonly known to those skilled in the art.
  • step 302 may further include filling the sensor assembly 10 with ambient air.
  • step 302 may further include placing the sensor assembly 10 under a vacuum.
  • step 302 may further include filling the sensor assembly 10 with a fluid having an accurately known density.
  • the sensor assembly may be filled with water.
  • step 304 an average temperature is determined from the plurality of temperatures.
  • average temperature 208 may be determined by averaging plurality of temperatures 206, as described above.
  • step 306 an average sensor time period is determined from the plurality of sensor time periods.
  • average sensor time period 209 may be determined by averaging plurality of sensor time periods 207, as described above.
  • step 308 the average sensor time period is compensated using the average temperature to generate a compensated sensor time period.
  • average sensor time period 209 may be compensated using average temperature 208 to generate compensated sensor time period 210, as described above.
  • Step 310 the compensated sensor time period is compared to a reference sensor time period.
  • the compensated sensor time period 210 may be compared to reference sensor time period 211, as described above.
  • step 312 it is indicated whether the compensated sensor time period is within a sensor time period error limit of the reference sensor time period. For example, it may be indicated whether compensated sensor time period 210 is within sensor time error limit 212 of reference sensor time period 211, as described above.
  • sensor validation method 400 may be performed in addition to method 300.
  • Method 400 of FIG. 4 begins with step 402.
  • an altitude is received.
  • the altitude is the height of the location of the sensor above sea level.
  • altitude 218 may be received, as described above.
  • step 404 the compensated sensor time period is compensated using the altitude.
  • compensated sensor time period 210 may be compensated using altitude 218, as described above.
  • step 404 may further include measuring a density of a fluid using the sensor assembly, and compensating the compensated sensor time period for a difference in density between the reference density and the measured density using the altitude.
  • measured density 219 may be measured using the sensor assembly 10.
  • Altitude 218 may be used to compensate any of the plurality of sensor time periods 207, the average sensor time period 209, or the compensated sensor time period 210, as described above.
  • sensor validation method 500 may be performed in addition to methods 300 and/or 400. As FIG. 5 depicts, method 500 begins with step 502. In step 502, a standard deviation is calculated using one of the plurality of temperatures and the plurality of sensor time periods. For example, standard deviation temperature 213 may be calculated using plurality of temperatures 206, or standard deviation sensor time period 214 may be calculated using plurality of sensor time periods 207, as described above.
  • Method 500 continues with step 504.
  • step 504 it is determined whether the standard deviation is greater than a limit. For example, it may be determined whether standard deviation temperature 213 is greater than standard deviation temperature limit 216, or it may be determined whether standard deviation sensor time period 214 is greater than standard deviation sensor time period limit 215, as described above. In embodiments, method 500 may be performed twice, evaluating each of standard deviation temperature 213 and standard deviation sensor time period 214.
  • step 504 If in step 504 it is determined that the standard deviation is greater than a limit, method 500 continues with step 506. If in step 504 it is determined that the standard deviation is not greater than a limit, method 500 continues with step 508. In step 506 it is indicated that a condition is unstable. In step 508 it is indicated that a condition is stable.
  • condition stable indicator 217 may be used to indicate whether the condition of sensor assembly 10 is stable.
  • meter electronics 20 may indicate whether a condition is stable by toggling an indicator light or otherwise providing a display for a user. In another embodiment, meter electronics 20 may indicate whether a condition is stable by sending an electronic report. Other methods of indicating the stability of sensor assembly 10 are also contemplated by this Application, as will be understood by those who are skilled in the art.

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Claims (14)

  1. Dispositif de mesure à élément vibrant (5) configuré pour effectuer une vérification de l'état de santé du dispositif de mesure, le dispositif de mesure à élément vibrant (5) comportant :
    un ensemble formant capteur (10) comprenant un élément vibrant (12), un capteur d'écart/de détection (17), et un dispositif d'entraînement (16) configuré pour faire vibrer l'élément vibrant (12) ;
    au moins un capteur de température (112) ; et
    des éléments électroniques de dispositif de mesure (20) accouplés au capteur d'écart/de détection (17), au dispositif d'entraînement (16), et audit au moins un capteur de température (112), les éléments électroniques de dispositif de mesure (20) étant configurés pour mesurer une pluralité de températures au moyen dudit au moins un capteur de température (112), caractérisé en ce que :
    les éléments électroniques de dispositif de mesure sont par ailleurs configurés pour mesurer une séquence de périodes de temps de capteur au moyen de l'ensemble formant capteur (10), la période de temps de capteur étant l'inverse de la fréquence de résonance de l'élément vibrant (12), pour déterminer une température moyenne à partir de la pluralité de températures, pour déterminer une période de temps de capteur moyenne à partir de la séquence de périodes de temps de capteur, pour compenser la période de temps de capteur moyenne au moyen de la température moyenne pour générer une période de temps de capteur compensée, pour comparer la période de temps de capteur compensée à une période de temps de capteur de référence, et pour indiquer si la période de temps de capteur compensée se trouve dans les limites de la limite d'erreur de la période de temps de capteur de la période de temps de capteur de référence.
  2. Dispositif de mesure à élément vibrant (5) selon la revendication 1, dans lequel l'étape consistant à mesurer la pluralité de températures (206) au moyen du capteur de température (112) et la séquence de périodes de temps de capteur (207) au moyen de l'ensemble formant capteur (10) comporte par ailleurs l'étape consistant à nettoyer l'ensemble formant capteur (10).
  3. Dispositif de mesure à élément vibrant (5) selon la revendication 1, dans lequel l'étape consistant à mesurer la pluralité de températures (206) au moyen du capteur de température (112) et la séquence de périodes de temps de capteur (207) au moyen de l'ensemble formant capteur (10) comporte par ailleurs l'étape consistant à remplir l'ensemble formant capteur (10) par de l'air ambiant.
  4. Dispositif de mesure à élément vibrant (5) selon la revendication 1, dans lequel l'étape consistant à mesurer la pluralité de températures (206) au moyen du capteur de température (112) et la séquence de périodes de temps de capteur (207) au moyen de l'ensemble formant capteur (10) comporte par ailleurs l'étape consistant à placer l'ensemble formant capteur (10) sous vide.
  5. Dispositif de mesure à élément vibrant (5) selon la revendication 1, dans lequel l'étape consistant à mesurer la pluralité de températures (206) au moyen du capteur de température (112) et la séquence de périodes de temps de capteur (207) au moyen de l'ensemble formant capteur (10) comporte par ailleurs l'étape consistant à remplir l'ensemble formant capteur (10) avec, ou insérer l'ensemble formant capteur dans, un fluide ayant une densité connue précisément.
  6. Dispositif de mesure à élément vibrant (5) selon la revendication 1, dans lequel les éléments électroniques de dispositif de mesure (20) sont par ailleurs configurés pour calculer un écart type au moyen de l'une de la pluralité de températures (206) et de la séquence de périodes de temps de capteur (207), pour comparer l'écart type par rapport à une limite, et pour indiquer si l'écart type est supérieur à la limite.
  7. Procédé de vérification de l'état de santé d'un capteur, le procédé comportant les étapes consistant à :
    mesurer une pluralité de températures (206) au moyen d'au moins un capteur de température (112) et une séquence de périodes de temps de capteur (207) au moyen d'un ensemble formant capteur (10), l'ensemble formant capteur (10) comprenant un élément vibrant (12), un capteur d'écart/de détection (17), et un dispositif d'entraînement (16) configuré pour faire vibrer l'élément vibrant (12), la période de temps de capteur étant l'inverse de la fréquence de résonance de l'élément vibrant (12) ;
    déterminer une température moyenne (208) à partir de la pluralité de températures (206) ;
    caractérisé par les étapes consistant à :
    déterminer une période de temps de capteur moyenne (209) à partir de la séquence de périodes de temps de capteur (207) ;
    compenser la période de temps de capteur moyenne (209) au moyen de la température moyenne (208) pour générer une période de temps de capteur compensée (210) ;
    comparer la période de temps de capteur compensée (210) à une période de temps de capteur de référence (211) ; et
    indiquer si la période de temps de capteur compensée (210) se trouve dans les limites d'une limite d'erreur de temps de capteur (212) de la période de temps de capteur de référence (211) .
  8. Procédé selon la revendication 7, dans lequel l'étape consistant à mesurer la pluralité de températures (206) et la séquence de périodes de temps de capteur (207) au moyen de l'ensemble formant capteur (10) comporte par ailleurs l'étape consistant à nettoyer l'ensemble formant capteur (10).
  9. Procédé selon la revendication 7, dans lequel l'étape consistant à mesurer la pluralité de températures (206) et la séquence de périodes de temps de capteur (207) au moyen de l'ensemble formant capteur (10) comporte par ailleurs l'étape consistant à remplir l'ensemble formant capteur (10) par de l'air ambiant.
  10. Procédé selon la revendication 7, dans lequel l'étape consistant à mesurer la pluralité de températures (206) et la séquence de périodes de temps de capteur (207) au moyen de l'ensemble formant capteur (10) comporte par ailleurs l'étape consistant à placer l'ensemble formant capteur (10) sous vide.
  11. Procédé selon la revendication 7, dans lequel l'étape consistant à mesurer la pluralité de températures (206) et la séquence de périodes de temps de capteur (207) au moyen de l'ensemble formant capteur (10) comporte par ailleurs l'étape consistant à remplir l'ensemble formant capteur (10) avec, ou insérer l'ensemble formant capteur (10) dans, un fluide ayant une densité connue précisémemt.
  12. Procédé selon la revendication 7, comportant par ailleurs les étapes consistant à :
    calculer un écart type au moyen de l'une de la pluralité de températures (206) et la séquence de périodes de temps de capteur (207) ;
    comparer l'écart type par rapport à une limite ; et
    indiquer si l'écart type est supérieur à la limite.
  13. Procédé de vérification de l'état de santé d'un capteur, le procédé comportant les étapes consistant à :
    mesurer une pluralité de températures (206) au moyen d'au moins un capteur de température (112) et une séquence de périodes de temps de capteur (207) au moyen d'un ensemble formant capteur (10), l'ensemble formant capteur (10) comprenant un élément vibrant (12), un capteur d'écart/de détection (17), et un dispositif d'entraînement (16) configuré pour faire vibrer l'élément vibrant (12), la période de temps de capteur étant l'inverse de la fréquence de résonance de l'élément vibrant (12) ;
    caractérisé par les étapes consistant à :
    calculer un premier écart type au moyen d'un premier ensemble de données comportant l'une parmi la pluralité de températures (206) ou la séquence de périodes de temps de capteur (207) ;
    comparer le premier écart type (213, 214) à une première limite (215, 216) ; et
    indiquer si le premier écart type (213, 214) est supérieur à la première limite (215, 216).
  14. Procédé selon la revendication 13, comportant par ailleurs les étapes consistant à :
    calculer un deuxième écart type (213, 214) au moyen d'un deuxième ensemble de données comportant l'une parmi la pluralité de températures (206) ou la séquence de périodes de temps de capteur (207), dans lequel le premier ensemble de données est différent du deuxième ensemble de données ;
    comparer le deuxième écart type (213, 214) à une deuxième limite (215, 216) ; et
    indiquer si le deuxième écart type (213, 214) est supérieur à la deuxième limite (215, 216).
EP14721171.8A 2013-04-18 2014-04-03 Appareil et procédés pour la vérification d'un capteur d'un dispositif de mesure vibratoire Active EP2986964B1 (fr)

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AU2014254365A1 (en) 2015-12-03
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CA2908036C (fr) 2019-08-20
US20160061707A1 (en) 2016-03-03
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CN105339776A (zh) 2016-02-17
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JP2017207504A (ja) 2017-11-24
AR096033A1 (es) 2015-12-02
HK1221506A1 (zh) 2017-06-02
WO2014172111A1 (fr) 2014-10-23
US10215677B2 (en) 2019-02-26
BR112015026190A2 (pt) 2017-07-25
KR101920832B1 (ko) 2018-11-21
MX363154B (es) 2019-03-13
RU2619829C1 (ru) 2017-05-18
AU2014254365B2 (en) 2017-06-15
EP2986964A1 (fr) 2016-02-24
SG11201508323XA (en) 2015-11-27
EP3035028A1 (fr) 2016-06-22
CA2908036A1 (fr) 2014-10-23
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BR112015026190B1 (pt) 2020-11-17
JP6707059B2 (ja) 2020-06-10

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